In this paper an infinite dimensional Morse theory for lightlike geodesics joining a point with a timelike curve on a class of Lorentzian manifolds is developed under intrinsic assumptions. It yields applications to the gravitational lens effect. In particular we show that the number of images in the gravitational lens effect is infinite or odd.
On a Fermat principle in general relativity. A Morse Theory for light rays / Giannoni, Fabio; Masiello, Antonio. - In: GENERAL RELATIVITY AND GRAVITATION. - ISSN 0001-7701. - STAMPA. - 28:7(1996), pp. 855-897. [10.1007/BF02104754]
On a Fermat principle in general relativity. A Morse Theory for light rays
Antonio Masiello
1996-01-01
Abstract
In this paper an infinite dimensional Morse theory for lightlike geodesics joining a point with a timelike curve on a class of Lorentzian manifolds is developed under intrinsic assumptions. It yields applications to the gravitational lens effect. In particular we show that the number of images in the gravitational lens effect is infinite or odd.File in questo prodotto:
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